A sleeve rolling device

Abstract

A sleeve rolling device, relating to the technical field of sleeve chain manufacturing equipment, includes a rounding screw. The rounding screw has a central blanking hole, the top of which is expanded to form a stepped mounting hole. A second rounding die and an oil pad are sequentially mounted from bottom to top on the stepped mounting hole. The oil pad has an annular boss on its top, and a first rounding die is coaxially fitted onto the annular boss. The inner diameters of the first rounding die, oil pad, and second rounding die match the outer diameter of the sleeve being processed and a rounding pin passes through them. A cutter and a top cutter are respectively provided on both sides of the pin body above the first rounding die. The cutter, top cutter, and rounding pin work together. This invention can effectively improve the sleeve processing effect, increase work efficiency, and avoid damage to the rounding pin and the sleeve workpiece.

Description

Technical Field

[0001] This invention relates to the technical field of sleeve chain manufacturing equipment, specifically to a sleeve winding device. Background Technology

[0002] Roller chains are a common type of mechanical transmission chain, widely used in motorcycles, bicycles, industrial and agricultural machinery, construction machinery, and many other fields, and have become a fundamental mechanical component. Chain drives offer many advantages over belt drives, including constant, inelastic slippage, high load-bearing capacity, greater environmental adaptability, longer lifespan, lower maintenance costs, and a compact structure, making them suitable for space-constrained applications.

[0003] The sleeve is a crucial component of the sleeve roller chain. Currently, the sleeve is rolled by placing a nested cylindrical material on the rounding nail body and then rounding it. To prevent the rounding nail from shifting during the rounding process and breaking under the impact of the cutting tool, special consumable parts or molds are needed to fix the lower part of the nail body. This results in complex equipment structure, cumbersome construction procedures, and low efficiency. Moreover, if the fixing effect is not good, it can easily damage the surface of the sleeve and reduce the processing quality. After the rounding nail is rounded, the existing method is to directly push the sleeve into or out of the rounding mold with the rounding nail, which can damage the end face of the sleeve and further reduce the processing quality of the sleeve. Utility Model Content

[0004] This invention discloses a sleeve rolling device, the purpose of which is to solve the problems existing in the prior art mentioned in the background section.

[0005] To achieve the above objectives, the technical solution of this invention is as follows: A sleeve rolling device includes a rounding screw with a blanking hole at its center. The top of the blanking hole is expanded to form a stepped mounting hole. A second rounding die and an oil pad are installed sequentially from bottom to top on the stepped mounting hole. The top of the oil pad has an annular boss, and a first rounding die is coaxially fitted on the annular boss. The inner diameters of the first rounding die, the oil pad, and the second rounding die match the outer diameter of the sleeve being processed and a rounding pin passes through them. A cutter and a top cutter are respectively provided on both sides of the pin body above the first rounding die. The cutter, top cutter, and rounding pin are used in conjunction.

[0006] Preferably, the rounded screw is fixed to the worktable by a fixing member, and the discharge hole passes through the lower end of the worktable and the top end of the rounded screw.

[0007] Preferably, the upper part of the round nail forms a connecting part by expanding its diameter. The outer diameter of the connecting part is at least in sync with the outer diameter of the first layer of round mold. The connecting part is connected to a first driving mechanism, which drives the round nail to move up and down. The outer ends of the cutter and the top cutter are respectively connected to a second driving mechanism and a third driving mechanism. The second driving mechanism and the third driving mechanism cooperate with each other to realize the closing and opening between the cutter and the top cutter.

[0008] Preferably, the ends of the cutter and the top cutter are both semi-circular, forming a complete circular structure after docking. The inner diameter of the circular structure is smaller than the outer diameter of the sleeve to ensure that the sleeve has a set interference fit with the round nail during the round nailing process.

[0009] Preferably, the top of the inner hole of the first layer of the round mold is integrally formed with a trumpet-shaped guide hole.

[0010] Preferably, the inner holes of the first rounding die, the second rounding die, and the oil pad are all interference-fitted with the outer wall of the sleeve after rounding, and the friction between the inner holes of the first rounding die, the oil pad, and the second rounding die and the outer wall of the sleeve is sufficient to pull the sleeve out when the rounding nail rises.

[0011] Preferably, the sleeve located in the inner hole of the first layer rounding mold, the inner hole of the oil pad, and the inner hole of the second layer rounding mold constitutes the support structure during the rounding nail encirclement process.

[0012] The novel sleeve rolling equipment has the following beneficial effects: 1. Conventional equipment requires the use of consumable parts or other molds to fix the rounding nail in order to secure it. This new design uses a first-layer rounding mold, an oil pad, and a second-layer rounding mold. The sleeve is stacked on top of each other and interference-fitted into the inner hole of the three. This forms a stable support structure for the lower part of the rounding nail during the rounding process, ensuring the stability of the rounding nail's position during the rounding process. This improves the rounding effect and avoids damage to the rounding nail caused by the impact of the cutting tool.

[0013] 2. This new type of blade has two semicircles at the ends of the top blade and the cutter. Through synchronous operation, the two semicircles are joined together to form a whole circle, which compresses the sleeve material. With the help of the rounding nail, the roundness of the sleeve is greatly improved.

[0014] 3. Since the sleeve accumulated in the second layer of the rounding mold and oil pad achieves the fulcrum effect, no other molds are needed. The sleeve is rounded by the ejector and cutter alone, which greatly reduces the number of machine operation steps and effectively improves work efficiency.

[0015] 4. Because the sleeves are stacked one on top of the other and pressed down to discharge material inside the round die, unlike the single pressing by the round nail, the end faces of the sleeves are squeezed against each other, avoiding the end face indentations caused by the pressing of the round nail (due to high resistance), and the end face is flatter. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of this novel invention; Figure 2 A top view of the structure when the cutter and the top cutter wrap around the sleeve on the round nail.

[0017] The markings in the diagram are: 1. Cutting blade; 2. Top cutter; 3. Rounding nail; 31. Nail body; 32. Connecting part; 4. First rounding mold; 41. Guide hole; 5. Oil pad; 51. Annular boss; 6. Second rounding mold; 7. Sleeve at the inner hole of the oil pad; 8. Rounding screw; 9. Sleeve on the nail body; 10. Blanking hole; 101. Stepped mounting hole; 11. Guide rail. Detailed Implementation

[0018] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0020] Example 1: A sleeve rolling device, such as Figure 1 As shown, the device includes a rounding screw 8, which has a blanking hole 10 at its center. The top of the blanking hole 10 is enlarged to form a stepped mounting hole 101. A second rounding mold 6 and an oil pad 5 are installed sequentially from bottom to top on the stepped mounting hole 101. The top of the oil pad 5 has an annular boss 51. A first rounding mold 4 is coaxially fitted on the annular boss 51. The inner diameter of the first rounding mold 4, the oil pad 5, and the second rounding mold 6 matches the outer diameter of the sleeve being processed and a rounding nail 3 passes through them. The rounding nail 3 is located above the first rounding mold 4. A cutter 1 and a top cutter 2 are respectively provided on both sides of the nail body 31. The cutter 1, the top cutter 2, and the rounding nail 3 are used in conjunction.

[0021] In this embodiment, the stepped mounting hole 101 forms a limiting structure for the second rounding die 6 and the oil pad 5, and the annular boss forms a limiting structure for the bottom of the first rounding die. The installation method between the stepped mounting hole, the second rounding die, the oil pad, and the first rounding die can be an interference fit or bolt fixation. Among them, the oil pad is a commonly used device, and its function is: because during the rolling process, the graded rounding will cause impurities and burrs to be generated on the surface of the sleeve, the inner wall of the oil pad has oil channels to flush away impurities and burrs by injecting oil and reduce the temperature rise caused by interference rounding. The rounding pin is inserted into the inner hole of the second rounding die, the oil pad, and the first rounding die, which on the one hand realizes the conveying of the sleeve after rounding, and on the other hand, the first and second rounding dies round the sleeve to further improve the roundness of the sleeve. The cutter 1 and the top cutter 2 are used to encircle the sleeve 9 workpiece material on the nail body. The workpiece material is pre-cut and initially rolled into shape. Oil holes are provided at the cut, which can realize the directional assembly of the gap and oil holes of the subsequent slotted sleeve.

[0022] Example 2: Based on Example 1, this example discloses: like Figure 1 As shown, the rounding screw 8 is fixed to the worktable (a common structure, not shown in the figure) by a fixing member, and the blanking hole 10 passes through the lower end of the worktable and the top end of the rounding screw 8. The formed sleeve processed by the first rounding die and the second rounding die is discharged through the blanking hole.

[0023] Example 3: Based on Example 2, this example discloses: like Figure 1 , 2 As shown, the upper part of the round nail 3 forms a connecting part 32 by expanding its diameter. The outer diameter of the connecting part is at least in sync with the outer diameter of the first layer of round mold. The connecting part 32 is connected to the first driving mechanism (not shown in the figure, but can be a cylinder, hydraulic cylinder, or the working end of a punch press). The first driving mechanism is used to drive the round nail 3 to move up and down. The outer ends of the cutter 1 and the top cutter 2 are respectively connected to the second driving mechanism (not shown in the figure, but can be a cylinder) and the third driving mechanism (not shown in the figure, but can be a cylinder). The second driving mechanism and the third driving mechanism cooperate with each other to realize the closing and opening between the cutter 1 and the top cutter 2.

[0024] like Figure 2As shown, the ends of the cutter 1 and the top cutter 2 are both semi-circular, forming a complete circular structure after docking. The inner diameter of the circular structure is smaller than the outer diameter of the sleeve to ensure that the sleeve has a set interference fit with the rounding nail 3 during the rounding process, thereby enabling the rounding nail to drive the sleeve through the inner hole of the first rounding mold 4 into the inner hole of the oil pad 5. Since the outer diameter of the connecting part is at least matched with the outer diameter of the first rounding mold, when the sleeve enters the first rounding mold, it can be pushed down by the step formed between the connecting part and the nail body. After the sleeve is completely entered into the first rounding mold, when the rounding nail is pulled out, the bottommost sleeve is discharged through the discharge hole.

[0025] Example 4: Based on Example 3, this example discloses: like Figure 1 As shown, the top of the inner hole of the first layer rounding mold 4 is integrally formed with a trumpet-shaped guide hole 41 so that the rounded sleeve can smoothly enter the first layer rounding mold 4 under the action of the rounding nail.

[0026] like Figure 1 As shown, the inner holes of the first rounding die 4, the second rounding die 6, and the oil pad 5 are all interference-fitted with the outer wall of the rounded sleeve, and the friction between the inner holes of the first rounding die, the oil pad 5, and the second rounding die 6 and the outer wall of the sleeve is sufficient to allow the rounding nail 3 to be pulled out of the sleeve when it rises. Preferably, the interference fit between the inner hole of the second rounding die and the sleeve is greater than the interference fit between the first rounding die and the sleeve.

[0027] like Figure 1 As shown, the sleeve located in the inner hole of the first layer rounding mold 4, the inner hole of the oil pad 5, and the inner hole of the second layer rounding mold 6 constitutes the support structure during the rounding process of the rounding nail 3.

[0028] During the process of rounding the sleeve material, if the rounding nail itself cannot be stably supported, it will break due to the impact force of the cutter and the ejector. The new "sleeve located in the inner hole of the first rounding mold, the inner hole of the oil pad 5 and the inner hole of the second rounding mold 6 constitutes the support structure for the rounding nail 3 during the rounding process", which ensures the stable posture of the rounding nail during the rounding process and avoids damage due to impact force.

[0029] The working principle of this new type: Initially, stacked sleeves are stored in the inner holes of the first layer rounding die, the oil pad, and the second layer rounding die. After the rounding nail is lifted, its bottom remains inside the first layer rounding die and cooperates with the stored sleeves to form a lower fulcrum. The sleeves, which are wrapped around the nail body by the cutter and the ejector, are lowered again under the action of the rounding nail and inserted into the first layer rounding die. When the rounding nail is pulled out and the bottom of the nail body returns to the sleeve inside the first layer rounding die, the bottommost sleeve is dropped through the blanking hole. The above process is repeated to achieve continuous processing of the sleeves.

[0030] Because the rounding process of the nail remains stable, no additional vulnerable parts are needed to support it, which ensures a better rounding effect of the sleeve on the nail body, reduces the scratches formed between the sleeve surface and the tool, and between the end face and vulnerable parts. Then, after two rounding processes, the dimensional accuracy and dimensional repeatability of the sleeve are greatly improved.

Claims

1. A sleeve rolling device, characterized in that: it includes a rounding screw, wherein the rounding screw has a blanking hole at its center, and the top of the blanking hole is expanded to form a stepped mounting hole, wherein a second rounding die and an oil pad are installed sequentially from bottom to top on the stepped mounting hole, wherein the top of the oil pad has an annular boss, and a first rounding die is coaxially fitted on the annular boss, wherein the inner hole dimensions of the first rounding die, the oil pad, and the second rounding die match the outer diameter of the sleeve being processed and a rounding pin passes through them, wherein a cutter and a top cutter are respectively provided on both sides of the pin body above the first rounding die, and the cutter, the top cutter, and the rounding pin are used in conjunction.

2. The sleeve rolling device as described in claim 1, characterized in that: The rounded screw is fixed to the workbench by a fastener, and the discharge hole passes through the lower end of the workbench and the top end of the rounded screw.

3. The sleeve rolling device as described in claim 2, characterized in that: The upper part of the round nail is expanded to form a connecting part, the outer diameter of which is at least in sync with the outer diameter of the first layer of round mold. The connecting part is connected to the first driving mechanism, which drives the round nail to move up and down. The outer ends of the cutter and the top cutter are respectively connected to the second driving mechanism and the third driving mechanism. The second driving mechanism and the third driving mechanism cooperate with each other to realize the closing and opening of the cutter and the top cutter.

4. The sleeve rolling device as described in claim 3, characterized in that: The ends of the cutter and the top cutter are both semi-circular, forming a complete circular structure after being joined together. The inner diameter of the circular structure is smaller than the outer diameter of the sleeve to ensure that the sleeve has a set interference fit with the round nail during the round nailing process.

5. The sleeve rolling device as described in claim 4, characterized in that: The top of the inner hole of the first layer of the round mold has an integrally formed trumpet-shaped guide hole.

6. The sleeve rolling device as described in claim 5, characterized in that: The inner holes of the first rounding die, the second rounding die, and the oil pad are all interference-fitted with the outer wall of the sleeve after rounding. The friction between the inner holes of the first rounding die, the oil pad, and the second rounding die and the outer wall of the sleeve is sufficient to pull the rounding nail out of the sleeve when it rises.

7. The sleeve rolling device as described in claim 6, characterized in that: The sleeves located in the inner holes of the first layer of rounding mold, the inner hole of the oil pad, and the inner hole of the second layer of rounding mold constitute the support structure during the rounding nail encirclement process.

Images